... Ball size from 1''-8'', soft, medium, and hard available PM DN125 rubber sponge ball for pipe cleaning:Concrete Pump Cleaning ... ,hard ,medium softOD95mmDN100 (4 inch) soft ,hard ,medium softOD124mm DN125(5 inch) soft ,hard ,medium softOD150mm DN150(6 inch) soft ,hard ... concrete pump and concrete pump truck in construction work equipment PM DN125 rubber sponge ball for pipe cleaning